Steam boiler



2 Sheets-Sheet 1.

W. KENT.

STEAM BOILER.

(No Model.)

(No Model.) 2 Sheets-S heet 2.

. W. KENT.

V STEAM BOILER. No. 317,653. Patented May 12, 1885.

N. PETERS. Photo-Lithograph. Waehlnmon, n, c.

UNITED STATES PATENT Urrrcn.

WILLIAM KENT, OF JERSEY CITY, NEW JERSEY.

STEAM-BOILER.

SPECIFICATION forming part. of Letters Patent I50. 317,653, dated May 12, 1885.

Application filed May 7, 1884. (No model.)

To all whom it may concern.-

Be itknown that I, WILLIAM KENT, a citizen of the United States, residing at Jersey City, in the county of Hudson and State of New Jersey, have invented certain new and useful Irnprovements in Steam-Boilers; and I do hereby declare the following to be afull, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to certain novel and useful improvements in that class of boilers known as water-tube boilers, and has for its object to simplify and cheapen their construction, and also to save space; and with these ends in view my invention consists in the details of construction and combination of elements hereinafter fully and in detail explained, and then specifically designated by the claim.

In order that those skilled in the art to which my invention appcrtains may more fully understand its construction and adaptation, I will proceed to describe the same in detail, referring by letter to the accompanying drawings, forming a part of this specification, in which Figure 1 is a front view of a boiler con structed in accordance with my improvement, and with the water-leg broken away, showing the tiling in section. Fig. 2 is a side elevation of said boiler without the tiling; Fig. 3, a rear View of my improved boiler; Fig. 4, a plan view of a horizontal section of the front water-leg; Fig. 5, a similar view of the rear water-leg; Fig. 6, a detail vertical section taken at the line a: wof Fig. 3; Fig. 7, a detail sectional view showing the way in which the hand-holes are closed, and Fig. 8 a modification showing a different way of making the hand-hole plates.

Similar letters denote like parts in the several figures of the drawings. I

A is a steam and water drum in which the water-level is carried at any convenient height.

B B are connectingboxes.

G O are water-legs or tube-heads into which are expanded the inclined water-tubes D. The water-legs or tube-heads O O, constructed as shown in Figs. tand 5, each have two similar sheets of metal bent or fianged,and then welded or riveted together. At the bottom of the front tube-head, Fig. 1, I make an opening, L, which gives access to the furnace and ash-pit, and which is closed by the fire-doors and ash-pit doors. In the rear tube-head, Fig. 3, I make a similar opening at the top of the tube-head, through which the gases of combustion escape to the chimney. For the sake of convenience of construction and ease of duplication of parts, I prefer to make the front and rear tubeheads exact duplicates of each other, each being formed of two sheets, which latter are themselves duplicates. Thus the front tubehead can be made the rear tubehead by simply turning itupside down. I prefer to place both of these heads in the boiler in a vertical position, and for the purpose of expanding the inclined tubes into these two heads I press or otherwise form the rear sheet of the front tubehead and the front sheet of the rear tubehead with slight elevations and depressions at the point in which the tubes are to be expanded, and I do this preferably before boring holes into which the tubes are to be expanded. The shape of these elevations or depressions is shown in Fig. 6. The portion of the'sheet marked F, into which is bored the hole for the tube, is pressed into such a position that its plane is at right angles to the axis of the tube. By such indentation of the tube-sheet I am enabled to make a perfectlytight joint between the tube and the sheet by means of an ordinary roller expander.

On the outer sheets of the tube-heads-that is, on the front sheet of the front tube-head and the rear sheet of the rear tube-head there are placed hand-holes opposite the end of each tube and in line with it, through which the same may be cleaned or removed, if necessary. These holes may be made either circularor oblong, and may be closed by any of the usual methods of closing hand-holes, but the method which I prefer is to make these holes slightly oblong; thus for a four-inch tube I would make the hole four and a quarter inches wide by five and a quarter inches long, the longer direction being vertical, and I would close it by means of a hand-hole plate with pieces at tached to bolt on the inside of the sheet and a washer and nut on the outside, as shown in Fig. 7, in which N represents the hand-hole plate and M the nut.

I have two ways of making the hand-hole ICU plate, as shown in Figs. 7 and 8. N, Fig. 7, shows the hand-hole plate made of cast-iron, which is east around the bolt, thelatter being thus held firmly in position. N, Fig. 8, shows the plate made of wrought-iron or steel, in which a hole is punched and the bolt placed in it. The bolt and plate are welded or riveted together,and the plate stamped by a droppress or otherwise formed into the finished shape.

To secure a perfectly-tight steai'n-joint by means of the hand-hole plate and washer here inbefore described, I insert a small ring, P, Fig. 7, of lead or other suitablematerial, within the hole in the tube-sheet, and then when I place the hand-hole plate N and washerO in position and screw down the nut M upon the bolt'T, as shown in Fig. 7, the lead is squeezed between the tube-sheet, the hand-hole plate, and the washer in such a manner as to fill all the space through which steam or water could escape, thus making a perfect joint.

The boiler thus described may be set in brick-work in the usual manner; but for the sake of economizing in the cost of brick, and also in space, I adopt the system of watercooled side walls shown at G and G in Figs. 1 and 3. I place the inclined water-tubes at the side of the boiler closer together than those in the body of the boiler, and fill the spaces between the outer row with fire-brick or other refractory material. Then outside of this I place a piece of sheet-iron, I. which is held in position by cleats K, fastened to the tubes. (See Fig. 1.) The space between the upper tube or tubes of this side wall and the drum is closed by a number of tiles, H, resting on the said tubes and against the drum. The tubes of the outside row need not be so much inclined as those within the boiler, so that they may thereby form a water-cooled wall nearly the whole height below the drum.

Having thus described my invention, whatI claim as new, and desire to secure by Letters Patent, 1's

In a water-tube boiler, the combination of the drum A, connecting-boxes B B, inclined tubes D D, and tube-heads O G, the front head, 0, being made with an opening in its lower portion, whereby access is had to the furnace, and

' the rear head 0 havin an o enin in its u per portion, whereby the gases may escape to the chimney, substantially as set forth.

In testimony whereof I affix my signatureIin presence of two witnesses.

WVILLIAM KENT.

\Vitnesses:

GEO. W. BRIGHT, WVM. KNOUS. 

